Process of making embossing dies



Patented June 4, 1929.

UNITED STATES EBER GUY KNAPLP, OF LOS ANGELES, CALIFORNIA.

PROCESS OF MAKING EMBOSSING DIES.

No Drawing. Application filed August 9, 1927, Serial No. 211,853.

This invention is directed to a process of making embossing dies of thetype used in the printing industry, being particularly directed to aneconomical and simple process for the production of the male die.

The process, generally considered, involves the use of a fibrousmaterial, such for example as chalk board, the printing on the surfacethereof of an inked impression of the cut or type of which the die is tobe a replica fixing the inked impression; and then eliminating thefibrous material by chemical action, leaving the replica as a maleembossing die capable of withstanding extremely hard usage andparticularly serviceable through its simplicity and economy ofproduction.

In the specific carrying out of the process, the operator places uponthe bed of a printing press the type or cut or the like which theproposed die is to duplicate. After indi" eating this type or cut, aninked impression is impressed upon the platen of the press. Chalk boardor like fibrous material of appropriate size is then fastened insuitable guides to the platen and the press operated, causing an inkedimpression on the reverse sides of the chalk board, one directly fromthe inked type or cut on the press bed and the other from the inkedimpression on the platen. Of course, this operation is carried out whilethe ink of the impression and plat en is still fresh.

The printed impressions on the chalk board are then covered withpulverized rosin and the chalk board subjected to heat until the rosinfuses with the ink of the impression. The chalk board is then immersedin a bath of chloride of lime, made up for instance of ten parts ofwater to one part of chloride of lime. While the chalk board issubmerged in the chloride of lime solution, the operator brushes thechalk board with a soft bristle brush, for example a camels hair brush,the brush operation being continued un il substantially all of the chalkon the chalk board is removed.

The chalk board with the impressions is then removed from the bath andsubjected to absorbent material, as blotting paper, to absorbpractically all of the moisture. The chalk board is finally placed underpressure and allowed to dry.

In preparing to use the embossing die thus produced, the die resultingfrom the process just described is secured, as by glue, to the platen ofthe press and utilized to Renewed April 24, 1929.

form the female portion of the die in the following manner. A number ofsheets of blotting paper or the like are secured to a board ofappropriate size, there being sufficient blotting paper to provide amass substantially type high. The board, secured in a printers chase, isthen applied to the bed of the press. The press is operated to cause themale die to make an impression in the blotting paper and the parts areallowed to remain in this position until the female portion of the dieis firmly fixed in the blotting paper.

The dies are then used in the ordinary manner for embossing and it hasbeen found that due to the action just described, the male die isextremely hard and of long life, remaining sharp and clear and suitablefor the usual embossing work.

It will be remembered that inked impressions are provided on both sidesof the chalk board. This double impressionserves to prevent the diereplica from being destroyed in the chemical treatment of the chalkboard.

What I claim to be new is:

1. A process of forming an embossing die, consisting in, producing aninked impression of the matter to be duplicated on chalk board, dustingthe impression with pulverized rosin, heating the board to fuse therosin and ink of the impression, and subjecting the board to a treatmentto dissolve the chalk.

2. A process for forming embossing dies, consisting in subjecting achalk board to a press impression of the matter to be duplicatedfollowing the application of ink to such matter, covering the ink of theimpression on the chalk board with pulverized rosin, heating the chalkboard to fuse the rosin and ink, and subjecting the chalk board to abath of chloride of lime to dissolve the chalk therefrom.

3. A process for forming embossing dies, consisting in subjecting achalk board to a press impression of the matter to be duplicatedfollowing the application of ink to such matter, covering the ink of theimpression on the chalk board with pulverized rosin, heating the chalkboard to fuse the rosin and ink, subjecting the chalk board to a bath ofchloride of lime, and brushing the chalk board while in the bath.

In testimony whereof I have afiixed my signature.

EBER GUY KNAPP.

